As the frontman of Brummie grindcore pioneers Napalm Death, Mark ‘Barney’ Greenway has become one of the most important and recognisable voices in the world of extreme music. Since joining Napalm in 1989, Barney has watched his band grow from noisy underground curios to a genuine cult phenomenon, his frenzied vocal style and impassioned political stance a key factor in their success. We spoke to him to find out what he’s learned in his years of service.